The neuromuscular junction is a well-studied example of a chemical synapse. which of the following statements describes a critical event that occurs at the neuromuscular junction? a) acetylcholine is released by axon terminals of the motor neuron. b) when the action potential reaches the end of the axon terminal, voltage-gated sodium channels open and sodium ions diffuse into the terminal. c) acetylcholine binds to its receptor in the junctional folds of the sarcolemma. its receptor is linked to a g protein. d) acetylcholine is released and moves across the synaptic cleft bound to a transport protein.

Option (A).

Explanation:

Neuromuscular junction is formed by the connection between a muscle fiber and motor neuron. This is the site at which motor neuron transmit signal to the muscle fiber and causes muscle contraction.

Neuromuscular junction involves various critical events. The most important process that occur during muscular junction is the release of acetylcholine by the axon terminals of the motor neuron. Acetylcholine is a neurotransmitter and causes the stimulation of muscle tissue.

Thus, the correct answer is option (A).

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.